CHAPTER 7: Ventricular Preexcitation
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ELECTROCARDIOGRAPHIC LOCALIZATION OF THE PATHWAY
OF VENTRICULAR PREEXCITATION
Tab l e 7 . 1 .
LA, left atrium; LV, left ventricle; RA, right atrium; RV, right ventricle.
Relationship between Pathway Location and Electrocardiographic (ECG)
Changes
ECG Appearance
Location of Abnormal Pathway
Group A: QRS mainly positive in leads V1 and V2
LA-LV
Group B: QRS mainly negative in leads V1 and V2
RA-RV
Many attempts have been made to determine the myocardial location of ventricular
preexcitation according to the direction of the delta waves in the various ECG leads.
Rosenbaum and colleagues
6
divided patients into two groups (groups A and B) on the basis
of the direction of the “main deflection of the QRS complex” in transverse plane leads V1
and V2 (Table 7.1).
